Question 1.
An OSPF router that redistributes routes is a(n):

a) external gateway
b) area border router
c) autonomous system border router
d) backbone router

Answer

Question 2.
When a router redistributes routes from domain A to domain B and from domain B to domain A, it is said to be performing:

a) Combined redistribution
b) Reflexive redistribution
c) Bi-directional redistribution
d) Mutual redistribution

Answer

Question 3.
Redistributing a large number of routes into a low-powered router can:

a) degrade performance
b) exhaust the router's memory
c) cause the router to reboot
d) All of the above

Answer

Answers

Question 1.
An OSPF router that redistributes routes is a(n):

a) external gateway
b) area border router
c) autonomous system border router
d) backbone router

Answer
c) autonomous system border router

Explanation
Any OSPF router that generates external Link State Announcements is an ASBR. Redistribution, however, is not the only mechanism that can cause OSPF to generate external LSAs. A default information-originate statement also will produce external LSAs.
[2468]

CCIE Topic(s): E
CCIE Objective(s): E7,E1
CCNA Topic(s):
CCNA Objective(s):

Question 2.
When a router redistributes routes from domain A to domain B and from domain B to domain A, it is said to be performing:

a) Combined redistribution
b) Reflexive redistribution
c) Bi-directional redistribution
d) Mutual redistribution

Answer
d) Mutual redistribution

Explanation
A router performs mutual redistribution when it redistributes routes in both directions. The CCIE lab focuses on mutual redistribution, although hierarchical redistribution is generally more useful in the real world. In hierarchical redistribution, one routing process exports full routes to another, but receives only the default route in response.
[2469]

CCIE Topic(s): E
CCIE Objective(s): E7
CCNA Topic(s):
CCNA Objective(s):

Question 3.
Redistributing a large number of routes into a low-powered router can:

a) degrade performance
b) exhaust the router's memory
c) cause the router to reboot
d) All of the above

Answer
d) All of the above

Explanation
Redistributing too many routes to an under-powered router can cause the router to fail or at least drastically reduce performance. The challenge in setting up route redistribution rarely is maximizing the routing information being redistributed. The challenge tends to be in minimizing the amount of routing information that is redistributed. Limiting redistribution to the default is the best case.

To avoid loops, filtering is apt to be needed when doing mutual redistribution. You can filter with distribute lists or route maps.
[2470]

CCIE Topic(s): E
CCIE Objective(s): E7
CCNA Topic(s):
CCNA Objective(s):

[IE-InRe-SQ1-F04]
[1999113001]